Anthraquinone acridones.



are s'rs Parana entice.

FRITZ ULLMANN, 0F BERLIN, GERMANY, ASSIGNOR TO ACTIEN GESELLSCHAFT Ffi'R ANILIN FABRIKATION, OF BERLIN, GERMANY.

ANTHRAQUINONE ACRIDONES.

No Drawing.

Specification of Letters Patent.

Application filed February 23, 1910.

To all whom it may concern:

Be it known that I, FRrrz ULLMANN, subject of the King of Bavaria, residing at Berlin, Germany, (my post-oflice address being Schwabischestrasse 8, Berlin, W. 30,) have invented certain new and useful Improvements in New Dyestuffs of the Anthraquinone Series and Process of Making Same, of which the following is a specification.

My invention relates to new vat dyestuffs of the anthraquinone series, being so-called anthraquinone-acridones and the simplest dyestulf of this class having the formula:

These new dyestuffs may be obtained by splitting 0H water from alpha-anilidoanthra-quinone-carboxylic acids of the general formula:

in which formula R represents an anthraquinone-residue or a substituted anthraquinone-residue, so that for instance a parent-material for my process is alpha-anilidoanthraquinone-carboxylic acid of the formula from alpha-nitro-anthraquinone or alpha chloranthraquinone and anthranilic acid) are covered with 2030 parts of benzene or another indifferent substance and are treated with 2.2 parts of phosphorous pentachlorid to convert them into the red anilido-anthraquinone-carboxylic acid chlorid. 35 parts of anhydrous aluminium chlorid are then added, whereupon the mixture becomes hot, much hydrogen chlorid is evolved and the mass becomes first brown and then green; after a short time the conversion is complete. The mixture is hereupon mixed with ice water, the benzene distilled away with steam and the anthraquinone-acridone that remains in the form of violet needles is filtered, washed and dried. When recrystallized from anilin, it forms violet needles of metallic luster, which are insoluble in alcohol and ether, but are easily soluble in boiling anilin to a violet solution. Concentrated sulfuric acid dissolves it to a red solution.

The dyestuff thus obtained forms by means of a salt of hydrosulfurous acid and an alkaline a blue vat from which cotton is dyed a very fast and clear bluish red tint.

It is obvious that my invention is not limited to the foregoing example or to the details given therein. For instance, instead of alpha-anilidoanthraquinone-carboxylic acid used in the above example the l-anilido-4- methylanthraquinone carboxylic acid obtainable from l-chloro-methylanthraquinone and anthranilic acid may be employed. The dyestuff thus obtained produces from the vat somewhat more bluish tints than the dyestuff of the above example.

Of course, in using the carboxylic acids directly for splitting off water instead of concentrated sulfuric acid named above any dehydrating agent suitable for my process may be employed.

What I claim is;

1. The hereinbefore-described new dyestuffs of the anthraquinone-series being anthraquinoneacridones, which new dyestuffs may be obtained by eliminating water from an alpha anilidoanthraquinone carboxylic acid of the general formula hereinbefore-defined, which new dyestuffs are insoluble in alcohol and ether, but easily soluble in boiling anilin to a violet solution, whereas sulfuric acid dissolves them to a red solution, which new dyestuffs form with a salt of hydrosulfurous acid and an alkali a vat from which cotton is dyed very fast red to violet tints.

2. As a new article of manufacture the hereinbefore-described new dyestufi' of the anthraquinone series being alpha-betaanthraquinonylacridone having the formula:

which new dyestufi when recrystallized from anilin forms violet needles of a metallic luster and is insoluble in alcohol and ether but is easily soluble in boiling anilin to a violet solution, whereas sulfuric acid dissolves it to a red solution, which new dyestuff forms with a salt of hydrosulfurous acid and an alkali a blue vat from which cotton is dyed a very fast bluish red tint.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

FRITZ ULLMANN.

Witnesses HENRY HAsPER, lVoLDEMAR HAUPT. 

